Hi Jay - interested in your post. I have built one of these cars in the UK so if you have any questions feel free to PM me. In fact if there is anyone else out there in the UK who has built a CAV I'd like to hear from them!
I settled on this car from the alternatives after seeing a built car at one of the car shows, seeing the quality and because it is a mono! Then as now I guess it was more expensive than the competition but not radically so. Most of these cars are very good though and what particularly appeals to you is a personal thing.
I did find that I spent quite a bit more than the "base price" which is the norm I guess for a built project unless you have an iron will! My experience was that there were quite a number of mostly small items that needed to be obtained and this does tend to make the cost mount up. My advice would be not to compromise where you can see / feel the effect - by all means shop for the best deal on parts but for those elements critical to the look and feel of the car like the gauges, you will want the best. I fitted Smiths which are made in South Wales and as it did not make sense for these to be shipped to South Africa and then back to the UK I sourced them directly. I would also go for a/c and full leather fit out - this means the dash, seats, centre console and roof lining.
Also I would recommend buying the kit with the body panels already fitted as this largely cuts out what I'm told is a very painful and time consuming process of fitting them - like a 3 D jigsaw!
The one thing I might have changed, which is worth you thinking about, are the wheel sizes. 15 inch are the authentic size but big tyres for the rear on 10 inch wheels of high enough speed rating ("V" or "W" for UK SVA) are practically non existent. I believe there will be an Avon tyre out in the summer though that will fill this gap.
Finally don't underestimate the number of detail changes you will need to address to get the car UK SVA compliant. Fundamentally the cars are okay but there are quite a few things you will need to change ( this applies to any car but the UK manufacturers are better geared up for it I think).
Brian